HARD
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IMPORTANT
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A semicircular wire of radius rotates in uniform magnetic field about its diameter with angular velocity . If the total resistance of the circuit is , then the mean power generated per period of rotation is
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Important Questions on Electromagnetic Induction
MEDIUM
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IMPORTANT
A charged capacitor of capacitance is discharging through a resistor of resistance . At what time the charge on the capacitor is equal to one half of its initial value?
MEDIUM
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IMPORTANT
In a coil of resistance , the induced current developed by changing magnetic flux through it, is shown in figure as a function of time. The magnitude of change in flux through the coil is
EASY
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IMPORTANT
Two inductors and are connected in parallel and a time varying current flows as shown in figure. The ratio ot current at any ime Is
EASY
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IMPORTANT
A resistor , an inductor , a capacitor and voltmeters and are connected to an oscillator in the circuit as shown in the adjoining diagram. When the frequency of the oscillation is increased, then at the resonant frequency, the voltmeter reading is zero in the case of
EASY
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IMPORTANT
A conducting circular loop is placed in a uniform magnetic field, with its plane perpendicular to the loop. The radius of the loop is made to shrink at a constant rate of . The induced emf when the radius is , is
